tests/pools/thread/fixed.test.js

   1 const { expect } = require('expect')
   2 const { FixedThreadPool } = require('../../../lib/index')
   3 const { WorkerFunctions } = require('../../test-types')
   4 const TestUtils = require('../../test-utils')
   5
   6 describe('Fixed thread pool test suite', () => {
   7   const numberOfThreads = 6
   8   const pool = new FixedThreadPool(
   9     numberOfThreads,
  10     './tests/worker-files/thread/testWorker.js',
  11     {
  12       errorHandler: e => console.error(e)
  13     }
  14   )
  15   const emptyPool = new FixedThreadPool(
  16     numberOfThreads,
  17     './tests/worker-files/thread/emptyWorker.js',
  18     { exitHandler: () => console.log('empty pool worker exited') }
  19   )
  20   const echoPool = new FixedThreadPool(
  21     numberOfThreads,
  22     './tests/worker-files/thread/echoWorker.js'
  23   )
  24   const errorPool = new FixedThreadPool(
  25     numberOfThreads,
  26     './tests/worker-files/thread/errorWorker.js',
  27     {
  28       errorHandler: e => console.error(e)
  29     }
  30   )
  31   const asyncErrorPool = new FixedThreadPool(
  32     numberOfThreads,
  33     './tests/worker-files/thread/asyncErrorWorker.js',
  34     {
  35       errorHandler: e => console.error(e)
  36     }
  37   )
  38   const asyncPool = new FixedThreadPool(
  39     numberOfThreads,
  40     './tests/worker-files/thread/asyncWorker.js'
  41   )
  42
  43   after('Destroy all pools', async () => {
  44     // We need to clean up the resources after our test
  45     await echoPool.destroy()
  46     await asyncPool.destroy()
  47     await errorPool.destroy()
  48     await asyncErrorPool.destroy()
  49     await emptyPool.destroy()
  50   })
  51
  52   it('Verify that the function is executed in a worker thread', async () => {
  53     let result = await pool.execute({
  54       function: WorkerFunctions.fibonacci
  55     })
  56     expect(result).toBe(false)
  57     result = await pool.execute({
  58       function: WorkerFunctions.factorial
  59     })
  60     expect(result).toBe(false)
  61   })
  62
  63   it('Verify that is possible to invoke the execute method without input', async () => {
  64     const result = await pool.execute()
  65     expect(result).toBe(false)
  66   })
  67
  68   it('Verify that busy event is emitted', async () => {
  69     let poolBusy = 0
  70     pool.emitter.on('busy', () => ++poolBusy)
  71     for (let i = 0; i < numberOfThreads * 2; i++) {
  72       pool.execute()
  73     }
  74     // The `busy` event is triggered when the number of submitted tasks at once reach the number of fixed pool workers.
  75     // So in total numberOfThreads + 1 times for a loop submitting up to numberOfThreads * 2 tasks to the fixed pool.
  76     expect(poolBusy).toBe(numberOfThreads + 1)
  77   })
  78
  79   it('Verify that is possible to have a worker that return undefined', async () => {
  80     const result = await emptyPool.execute()
  81     expect(result).toBeUndefined()
  82   })
  83
  84   it('Verify that data are sent to the worker correctly', async () => {
  85     const data = { f: 10 }
  86     const result = await echoPool.execute(data)
  87     expect(result).toStrictEqual(data)
  88   })
  89
  90   it('Verify that error handling is working properly:sync', async () => {
  91     const data = { f: 10 }
  92     let inError
  93     try {
  94       await errorPool.execute(data)
  95     } catch (e) {
  96       inError = e
  97     }
  98     expect(inError).toBeDefined()
  99     expect(inError).toBeInstanceOf(Error)
 100     expect(inError.message).toBeDefined()
 101     expect(typeof inError.message === 'string').toBe(true)
 102     expect(inError.message).toBe('Error Message from ThreadWorker')
 103   })
 104
 105   it('Verify that error handling is working properly:async', async () => {
 106     const data = { f: 10 }
 107     let inError
 108     try {
 109       await asyncErrorPool.execute(data)
 110     } catch (e) {
 111       inError = e
 112     }
 113     expect(inError).toBeDefined()
 114     expect(inError).toBeInstanceOf(Error)
 115     expect(inError.message).toBeDefined()
 116     expect(typeof inError.message === 'string').toBe(true)
 117     expect(inError.message).toBe('Error Message from ThreadWorker:async')
 118   })
 119
 120   it('Verify that async function is working properly', async () => {
 121     const data = { f: 10 }
 122     const startTime = Date.now()
 123     const result = await asyncPool.execute(data)
 124     const usedTime = Date.now() - startTime
 125     expect(result).toStrictEqual(data)
 126     expect(usedTime).toBeGreaterThanOrEqual(2000)
 127   })
 128
 129   it('Shutdown test', async () => {
 130     const exitPromise = TestUtils.waitExits(pool, numberOfThreads)
 131     await pool.destroy()
 132     const numberOfExitEvents = await exitPromise
 133     expect(numberOfExitEvents).toBe(numberOfThreads)
 134   })
 135
 136   it('Should work even without opts in input', async () => {
 137     const pool1 = new FixedThreadPool(
 138       numberOfThreads,
 139       './tests/worker-files/thread/testWorker.js'
 140     )
 141     const res = await pool1.execute()
 142     expect(res).toBe(false)
 143     // We need to clean up the resources after our test
 144     await pool1.destroy()
 145   })
 146
 147   it('Verify that a pool with zero worker fails', async () => {
 148     expect(
 149       () => new FixedThreadPool(0, './tests/worker-files/thread/testWorker.js')
 150     ).toThrowError(new Error('Cannot instantiate a fixed pool with no worker'))
 151   })
 152 })